On Tue, Nov 18, 2008 at 1:57 PM, Rua Haszard Morris <[EMAIL PROTECTED]> wrote: > What are the different options for flipping the coordinates of the > destination view? I've tried doing it by scaling and translating the > CGContext, but this results in problems with underlining or the character > orientation (depending on whether i flip the view back before or after > drawing the text). > > At the moment the only method which results in correct text is to have a > custom view and override isFlipped - is this the only recommended method?
Doug answered the overall question, but maybe I'll chime on this bit specifically. As you're finding, -isFlipped and the CTM are entirely orthogonal pieces of data. If you're using NSLayoutManager, you need the current context to return YES to -[NSGraphicsContext isFlipped], and you also want the CTM set up so that the text goes where you want. There is no setter for -[NSGraphicsContext isFlipped], but you don't need to use a custom view. [NSGraphicsContext graphicsContextWithGraphicsPort:[originalContext graphicsPort] flipped:YES] would give you a graphics context object that is flipped without otherwise modifying the CTM or anything. -Ken > I ask because I have to use these strings within custom views (which may for > example have rotated contexts), as well as in standard controls, and simpler > custom views purely for drawing these attributed strings. If the only method > to have the attributes (particularly underline) interpreted correctly is to > perform the drawing in a isFlipped NSView subclass, then I need to rejig > things so the complex custom views embed an NSView rather than draw the > attributed string manually. > > thanks > Rua HM. > > On Nov 19, 2008, at 9:40 am, 11(November)/19/08, Rua Haszard Morris wrote: > >> Thanks for the link, you are right, I had not seen that document! >> >> On Nov 19, 2008, at 9:33 am, 11(November)/19/08, Douglas Davidson wrote: >> >>> >>> On Nov 18, 2008, at 12:18 PM, Rua Haszard Morris wrote: >>> >>>> To follow up.. below I have pasted the code that draws the text (for my >>>> test app, as opposed to the more complex ways of reproducing the bug >>>> elsewhere in my code). (the full test app is attached to the radar bug) >>>> >>>> I have been consulting the Text System Overview documentation, which I >>>> don't believe mentions this fact. >>>> >>>> http://developer.apple.com/documentation/Cocoa/Conceptual/TextArchitecture/TextArchitecture.html >>>> >>>> I can understand that drawing text top to bottom makes sense, but I am >>>> surprised that the coordinate system of the destination context has such >>>> far-reaching side effects. >>> >>> You're looking at the Text Systems Overview, which is very general >>> conceptual documentation, the sort you would consult to decide which class >>> to use. What you want is the Text Layout Programming Guide for Cocoa, which >>> gives more detailed direction as to how to use these classes. The first >>> section, >>> http://developer.apple.com/documentation/Cocoa/Conceptual/TextLayout/Concepts/LayoutManager.html >>> under >>> the heading "Glyph Drawing" says, "The text system expects view coordinates >>> to be flipped, like those of NSTextView." If you are going to be drawing >>> using the layout manager directly, this is a hard-and-fast rule. >>> >>> Douglas Davidson >>> >> >> _______________________________________________ >> >> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) >> >> Please do not post admin requests or moderator comments to the list. >> Contact the moderators at cocoa-dev-admins(at)lists.apple.com >> >> Help/Unsubscribe/Update your Subscription: >> >> http://lists.apple.com/mailman/options/cocoa-dev/r.haszardmorris%40adinstruments.com >> >> This email sent to [EMAIL PROTECTED] > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
